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Finding the Fourth Proportional to 375.61, 518.37 and 209.87

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Solution

The fourth proportional to 375.61, 518.37 and 209.87 is: 289.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.61 : 518.37 = 209.87 : x
  2. Step 2: Convert to fraction form
    375.61/518.37 = 209.87/x
  3. Step 3: Cross multiply
    375.61x = 518.37 × 209.87
  4. Step 4: Simplify right side
    375.61x = 108,790.31
  5. Step 5: Solve for x
    x = 108,790.31/375.61
  6. Step 6: Final answer
    x = 289.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.